2.7.4. Scanning electron microscopy (SEM)
For studying growth morphology using SEM, the samples were washed and
fixed in 2.5% glutaraldehyde for two h at room temperature. Then, the
samples dehydrated by incubating in ethanol for ten min ,which the
concentration is gradually increased (50, 60, 70, 80, 90, and 100%
V/V). Finally, the dehydrated samples were dried and sputter-coated with
gold and visualized using SEM.